It is probably a combination of timing and carb at that point-------just for a test -turn the dist toward more advance position and see if it helps----will probably take 8-10 adjustments til you find a sweet spot--------

After reading the introductory pages, go to page 22 and determine what you need to do. Tech hit some good points, re; your cam profile; however, I think you may be able to improve the performance a bit with different jet and metering rods. Unfortunately, you'll have to open the carburetor to determine if it is stock and work from there. Assuming it is stock, I'd opt for a .095 jet and 71 x 47 metering rods. All this can be done with the carb on the engine if you're very careful as one dropped small part can mean a lot of pulling apart to recover.

The jets and metering rods are available from Summit, JEGS, and probably your local parts hose.

I didnt feel like drilling and adding weight so the secondaries would open later so instead i found a 600 vaccuum secondary holley for 50 bucks and re built it, you can adjust the secondaries and my problem is gone.
It spins the tires too.